Garmin does not recommend the use of the Narco and King adapters with the GTX-327. (These are P/N: 010-10158-00 and P/N: 010-10159-00 respectively.) As a result, the GTX-327 should be regarded as a new installation when coming from the AT-50/AT-50A/AT-150 and KT-78A/KT-76A.

Until the introduction of Garmin's GTX-330, this was their best transponder. While the GTX-327 lacks the GTX-330's traffic features, it is an excellent unit, with many helpful convenience features.

The GTX-327 produces 200 watts of transmission power, offering long range and operation up to 50,000 feet. Plus, the GTX-327 does this without a cavity. As a result, reliability is improved, and no warm-up time is needed before operation.

The GTX-327 features:

Large, easy-to-read digital display

Numeric keypad for easy squawk entry

Dedicated VFR button to squawk 1200

Count up and count down timers

Displays pressure altitude from your encoder

4096 discrete codes

Mode C compatibility

System test capability

TSO'd

You may also be interested in an Encoder to use with this GTX-327. When installed with an Encoder, the GTX-327 will report both your position and altitude to ATC (Mode C).

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